When massive, open-pit mines like the Minera Escondida—in Chile's Atacama Desert—need to pull millions of tons of minerals out of the ground each year, they rely on fleets of huge, "Ultra-Class" haul trucks. The ETF Haul Train, however, pulls four times the minerals of these stone-toting behemoths with just one driver. »11/09/12 11:30am 11/09/12 11:30am